package com.smartandroid.sa.sherlock.internal;

import org.xmlpull.v1.XmlPullParser;

import android.app.Activity;
import android.content.Context;
import android.content.res.AssetManager;
import android.content.res.XmlResourceParser;
import android.os.Build;
import android.util.DisplayMetrics;
import android.util.Log;

import com.smartandroid.sa.sherlock.ActionBarSherlock;

public final class ResourcesCompat {
	private static final String TAG = "ResourcesCompat";

	// No instances
	private ResourcesCompat() {
	}

	/**
	 * Support implementation of {@code getResources().getBoolean()} that we can
	 * use to simulate filtering based on width and smallest width qualifiers on
	 * pre-3.2.
	 * 
	 * @param context
	 *            Context to load booleans from on 4.0+ and to fetch the display
	 *            metrics.
	 * @param id
	 *            Id of boolean to load.
	 * @return Associated boolean value as reflected by the current display
	 *         metrics.
	 */
	public static boolean getResources_getBoolean(Context context, int id) {
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
			return context.getResources().getBoolean(id);
		}

		DisplayMetrics metrics = context.getResources().getDisplayMetrics();
		float widthDp = metrics.widthPixels / metrics.density;
		float heightDp = metrics.heightPixels / metrics.density;
		float smallestWidthDp = (widthDp < heightDp) ? widthDp : heightDp;

		if (id == context.getResources().getIdentifier(
				"abs__action_bar_embed_tabs", "bool", context.getPackageName())) {
			// if (id == R.bool.abs__action_bar_embed_tabs) {
			if (widthDp >= 480) {
				return true; // values-w480dp
			}
			return false; // values
		}
		if (id == context.getResources().getIdentifier(
				"abs__split_action_bar_is_narrow", "bool",
				context.getPackageName())) {
			// if (id == R.bool.abs__split_action_bar_is_narrow) {
			if (widthDp >= 480) {
				return false; // values-w480dp
			}
			return true; // values
		}
		if (id == context.getResources().getIdentifier(
				"abs__action_bar_expanded_action_views_exclusive", "bool",
				context.getPackageName())) {
			// if (id == R.bool.abs__action_bar_expanded_action_views_exclusive)
			// {
			if (smallestWidthDp >= 600) {
				return false; // values-sw600dp
			}
			return true; // values
		}
		if (id == context.getResources().getIdentifier(
				"abs__config_allowActionMenuItemTextWithIcon", "bool",
				context.getPackageName())) {
			// if (id == R.bool.abs__config_allowActionMenuItemTextWithIcon) {
			if (widthDp >= 480) {
				return true; // values-w480dp
			}
			return false; // values
		}

		throw new IllegalArgumentException("Unknown boolean resource ID " + id);
	}

	/**
	 * Support implementation of {@code getResources().getInteger()} that we can
	 * use to simulate filtering based on width qualifiers on pre-3.2.
	 * 
	 * @param context
	 *            Context to load integers from on 3.2+ and to fetch the display
	 *            metrics.
	 * @param id
	 *            Id of integer to load.
	 * @return Associated integer value as reflected by the current display
	 *         metrics.
	 */
	public static int getResources_getInteger(Context context, int id) {
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
			return context.getResources().getInteger(id);
		}

		DisplayMetrics metrics = context.getResources().getDisplayMetrics();
		float widthDp = metrics.widthPixels / metrics.density;

		if (id == context.getResources().getIdentifier(
				"abs__max_action_buttons", "integer", context.getPackageName())) {
			// if (id == R.integer.abs__max_action_buttons) {
			if (widthDp >= 600) {
				return 5; // values-w600dp
			}
			if (widthDp >= 500) {
				return 4; // values-w500dp
			}
			if (widthDp >= 360) {
				return 3; // values-w360dp
			}
			return 2; // values
		}

		throw new IllegalArgumentException("Unknown integer resource ID " + id);
	}

	/**
	 * Attempt to programmatically load the logo from the manifest file of an
	 * activity by using an XML pull parser. This should allow us to read the
	 * logo attribute regardless of the platform it is being run on.
	 * 
	 * @param activity
	 *            Activity instance.
	 * @return Logo resource ID.
	 */
	public static int loadLogoFromManifest(Activity activity) {
		int logo = 0;
		try {
			final String thisPackage = activity.getClass().getName();
			if (ActionBarSherlock.DEBUG)
				Log.i(TAG, "Parsing AndroidManifest.xml for " + thisPackage);

			final String packageName = activity.getApplicationInfo().packageName;
			final AssetManager am = activity.createPackageContext(packageName,
					0).getAssets();
			final XmlResourceParser xml = am
					.openXmlResourceParser("AndroidManifest.xml");

			int eventType = xml.getEventType();
			while (eventType != XmlPullParser.END_DOCUMENT) {
				if (eventType == XmlPullParser.START_TAG) {
					String name = xml.getName();

					if ("application".equals(name)) {
						// Check if the <application> has the attribute
						if (ActionBarSherlock.DEBUG)
							Log.d(TAG, "Got <application>");

						for (int i = xml.getAttributeCount() - 1; i >= 0; i--) {
							if (ActionBarSherlock.DEBUG)
								Log.d(TAG,
										xml.getAttributeName(i) + ": "
												+ xml.getAttributeValue(i));

							if ("logo".equals(xml.getAttributeName(i))) {
								logo = xml.getAttributeResourceValue(i, 0);
								break; // out of for loop
							}
						}
					} else if ("activity".equals(name)) {
						// Check if the <activity> is us and has the attribute
						if (ActionBarSherlock.DEBUG)
							Log.d(TAG, "Got <activity>");
						Integer activityLogo = null;
						String activityPackage = null;
						boolean isOurActivity = false;

						for (int i = xml.getAttributeCount() - 1; i >= 0; i--) {
							if (ActionBarSherlock.DEBUG)
								Log.d(TAG,
										xml.getAttributeName(i) + ": "
												+ xml.getAttributeValue(i));

							// We need both uiOptions and name attributes
							String attrName = xml.getAttributeName(i);
							if ("logo".equals(attrName)) {
								activityLogo = xml.getAttributeResourceValue(i,
										0);
							} else if ("name".equals(attrName)) {
								activityPackage = ActionBarSherlockCompat
										.cleanActivityName(packageName,
												xml.getAttributeValue(i));
								if (!thisPackage.equals(activityPackage)) {
									break; // on to the next
								}
								isOurActivity = true;
							}

							// Make sure we have both attributes before
							// processing
							if ((activityLogo != null)
									&& (activityPackage != null)) {
								// Our activity, logo specified, override with
								// our value
								logo = activityLogo.intValue();
							}
						}
						if (isOurActivity) {
							// If we matched our activity but it had no logo
							// don't
							// do any more processing of the manifest
							break;
						}
					}
				}
				eventType = xml.nextToken();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		if (ActionBarSherlock.DEBUG)
			Log.i(TAG, "Returning " + Integer.toHexString(logo));
		return logo;
	}
}
